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Scientists know when you’re dreaming, thanks to a newly discovered brain wave signal

If you never remember your dreams, you’re not alone. A new study reveals that most people dream for hours each night, yet recall almost nothing, New Scientist reports. The study, which used EEG caps to monitor the brain waves of sleepers in the brain’s posterior “hot zone,” pinpointed a new signal that can accurately predict dreaming during non–rapid eye movement sleep. Previously, dreams were associated primarily with the brief, intermittent periods of rapid eye movement known as REM sleep. The study, published yesterday in Nature Neuroscience, suggests that dreaming in fact occurs in up to 71% of non-REM sleep. Scientists say the new signal may help them better understand different states of consciousness. Unfortunately, total dream recall is not yet one of them.

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